Black tongue slu Share definition Flag A girl who chain smokes, gives head and then refuses to brush her teeth. I saw Kayley leave Jeremy's room and chain smoke a carton of Camels. She's such a black tongue slu. Black tongue slu by AnonymousTruthBeTold March 2, 2010 0 0 Get merch Get the Black tongue slu mug. Buy Now — $32.95 See more merch